Liquids 'A' and 'B' are mixed to form an ideal Solution. Given, P0A=100mmHg , P0B =200mmHg. Calculate liquid and vapour composition if 2mole of 'A' and 3mole of 'B' were mixed. Calculate vapour pressure of each liquid in solution and total vapour pressure.
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Answer:
Vapour pressure of a solution containing A & B liquid is
P
T
=P
A
+P
B
P
A
=X
A
−P
A
o
X
A
= mole fraction of A; P
A
o
= Pure vapour pressure of A.
⇒P
A
=0.2×500Nm
−2
& P
B
=(1−0.2)×200Nm
−2
Thus P
T
=0.2×500Nm
−2
+0.8×200Nm
−2
⇒P
T
=260Nm
−2
Thus total vapour pressure of solution is 260Nm
−2
.
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